Hydraulic control system



0ct. 17, 1950Y E. c. oAKEs 2,526,039

HYDRAULIC coNTRoL SYSTEM Filed May 14, 194e -Xdmvm' 47 A 5 Patented Oct. 17, 1950 UNlTEDv-ASTATE Y. Edwin Cyril Oakes, h-festen,A England In Great Britain June 19, 1945 l l Application-May y14, 1946; serial No. 669.563

4; Claims.

The present invention relates to improvements "l in hydraulic control systems.

In order to ensure that theinow to a reservoir from a supply pipe is automatically adjusted to the outflow from the said reservoir, it has been usual to provide a valve controlling the delivery of water from the supply pipe controlled by a float disposed in the reservoir.

An object of the present invention is to provide a simplified control for reservoirs and tanks.

According to the present invention a hydraulic system for controlling a supply of water from a water mainto a reservoir includes in combination a cylinder having inletv and outlet 'ports adapted to be connected respectively rto va water main and a reservoir. a hollow shaft in said cylinder and extending through said cylinder', a valve having upper and lower pistons slidable in said cylinder and mounted about said shaft to dene a chamber therebetweema standpipe having an entrance lip adapted tobe arranged at a predetermined height in said reservoir and communicating with said hollow shaft, an outlet in said shaft below said lower piston whereby said lower` piston is Subject to water pressure in said shaft whenever water flows into it from said reservoir to raise said valve to close the inlet port against force of gravity, and a leak allowing rescape of water from said shaft ata predetermine rate after said Valve is raised.

The invention is further described Vwith reference to the accompanying drawing showing diagrammatically one form of construction in .side elevation..

A hollow piston rod 34 has upper'and lower pistons 35, 36 mounted thereon a xed distance apart and slidable in an .upper cylinder 42. A

Amain water supply pipe 3'l'communicates through Ainlet ports 38 and outlet port 53 in the upper cylinder 42 with pipe 39 leading'through the wall 32 to the reservoir. The piston 35 has a slightly larger area than the piston 36, this difference, however, not being such that the head of water inl pipe 39 is suiicient to lift the weight of pistons 35, 36 and connected parts; When the water of the reservoir has risen above the top end of a standpipe 40 (which projects through the wall 32 into the reservoir) this water can pass down the hollow piston rod 34 and through ports 4l in this piston rod to the 4space in the upper cylinder 42 beneaththe piston 36 causing the pis- The piston rod 3'4 may have an extension 45 upon it with a piston head 46 working in a lower cylinder 41, to the lower end of which a pipe 48 is connected passing up to a tank 49 and being under the control of a stop valve 56. A second pipe connection 5I controlled by an adjustablev 'stop valve 52 is arranged between the tank 49 and the upper cylinder 42 in which the piston works, this tank 49 and the valve control means 50, 52 acting therefore as a dashpot. Y

It will be noticed that the top of the standlpipe acts as a weir at a predetermined set height so that the valve only operates when water passes over this Weir due to a rise in'level in the reservoir.

I declare that what I claim is:

1. A hydraulic system for controllingy a supply shaft in said cylinder and extending through said cylinder, a valve having upper and lower pistons slidable in said cylinder and mounted about said shaft to define a chamber therebetween, a standpipe having an entrance lip adapted to be arranged at a predetermined height in said reservoir and communicating with said hollow shaft, an outlet in said shaft below said lower piston whereby said lower piston is subject to water pressure in said shaft whenever water flows into it from said reservoir to raise said valve to close the inlet port against force of gravity, and a leak allowing escape of water from said shaft at a predetermined rate after said valve is raised.

2. A hydraulic system for controlling a supply of water from a water main to a reservoir including irl-combination a cylinder having inlet and outlet ports adapted to be connected respectively to a water main and a reservoir, a 'hollow tons slidable in said cylinder and xedlyrmounted on said shaft to define a chamber therebetween,

a standpipe having an entrance lip adapted to be arrangedv at a predetermined height in said reservoir and communicating with said hollow shaft, an outlet in said shaft lbelow said lower piston whereby said lower piston is subject to ywater pressure in-said shaft whenever water flows into it from said reservoir to raise said valve to close the inlet port against force of gravity,land a leak allowing escape of water from said shaft at a predetermined rate after said valve is raised.

3. A hydraulic system as claimed in claim 1 including dashpots for controlling the rate of opening and closing of said valve.

4. A hydraulic system for controlling a supply of water from a water main to a reservoir including in combination an upper cylinder. having inlet and outlet ports adapted to be connected respectively to a water main and a reservoir, a lower cylinder, a hollow shaft slidablel in said upper and lower cylinders and extending therethrough, a valve having upper and lower pistons slidable in said upper cylinder and xedly mounted on said shaft to dei-lne a chamber therebetween, a standpipe having an entrance lip adapted to be arranged at a predeterminedheight.

in said reservoir and communicating will 'said hollow shaft, an outlet in said :shaft below said lower piston whereby said lower piston is sub- .ject to water pressure in said shaft wlfienever` from said shaft at a predetermined rate after said valve is raised, a piston head on said shaft slidable in said lower cylinder, a container for liquid communicating with the upper cylinder above said upper piston and communicating with the lower cylinder below said piston head to eiect dashpot control of said valve.

4 EDWIN CYRIL'OAKES.

REFERENCES CITED The following references are of record in the 9 file' of this patent:

V'Number TED STATES PATENTS 

